MFC r200038:

MFC r200038:
Properly support -fPIE by linking PIE binaries with specially-built
Scrt1.o instead of crt1.o, since the later is built as non-PIC.

Separate i386-elf crt1.c into the pure assembler part and C code,
supplying all data extracted by assembler stub as explicit parameters.
Hide and localize _start1 symbol used as an interface between asm and
C code.

git-svn-id: svn://svn.freebsd.org/base/stable/8@201058 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f